如何停止每次打開新窗口？

Question

我有一個WPF應用程序，在其中點擊一個菜單項，打開一個窗口。現在，如果在窗口已經打開時再次單擊相同的菜單項，它將打開一個新窗口，但我不希望每次都打開一個新窗口。 我需要的是，如果窗口已經打開，那麼同一個窗口應該關注的不是一個新窗口。

在此先感謝。

Answer 1

如果你打開的窗口被用作簡單的對話框，你可以用下面的代碼

window.ShowDialog(); 

時，對話框會顯示你不能按你關閉此窗口的任何菜單項單元

Answer 2

您可以創建一個現場，並檢查它的設置：

private Window _dialogue = null; 
private void MaekWindowButton_Click(object sender, RoutedEventArgs e) 
{ 
    if (_dialogue == null) 
    { 
     Dialogue diag = new Dialogue(); 
     _dialogue = diag; 

     diag.Closed += (s,_) => _dialogue = null; //Resets the field on close. 
     diag.Show(); 
    } 
    else 
    { 
     _dialogue.Activate(); //Focuses window if it exists. 
    } 
} 

Answer 3

這樣一個相當強力方法也適用：

 bool winTest = false; 

     foreach (Window w in Application.Current.Windows) 
     { 
      if (w is testWindow) 
      { 
       winTest = true; 
       w.Activate(); 
      } 
     } 

     if (!winTest) 
     { 
      testWindow tw = new testWindow(); 
      tw.Show(); 
     } 

Answer 4

//First we must create a object of type the new window we want the open. 
NewWindowClass newWindow; 

private void OpenNewWindow() { 
    //Check if the window wasn't created yet 
    if (newWindow == null) 
    { 
     //Instantiate the object and call the Open() method 
     newWindow= new NewWindowClass(); 
     newWindow.Show(); 
     //Add a event handler to set null our window object when it will be closed 
     newWindow.Closed += new EventHandler(newWindow_Closed); 
    } 
    //If the window was created and your window isn't active 
    //we call the method Activate to call the specific window to front 
    else if (newWindow != null && !newWindow.IsActive) 
    { 
     newWindow.Activate(); 
    } 
} 
void newWindow_Closed(object sender, EventArgs e) 
{ 
    newWindow = null; 
} 

我認爲這解決了您的問題。

Att，